body {
  margin: 0 auto;
  min-width: 320px;
  max-width: 1080px;
  background: #fff;
  font-size: 14px;
  font-family: -apple-system, Helvetica, sans-serif;
  line-height: 1.5;
  color: #666;
}
.app {
  height: 45px;
}
.ap_ul li {
  float: left;
  height: 45px;
  list-style: none;
  color: #fff;
  background-color: #333;
  text-align: center;
  line-height: 45px;
}
.ap_ul li:nth-child(1) {
  width: 8%;
}
.ap_ul li:nth-child(1) img {
  width: 10px;
}
.ap_ul li:nth-child(2) {
  width: 10%;
}
.ap_ul li:nth-child(2) img {
  width: 30px;
  vertical-align: -23%;
}
.ap_ul li:nth-child(3) {
  width: 57%;
}
.ap_ul li:nth-child(4) {
  width: 25%;
  background-color: #e0332d;
}
.search-wrap {
  position: fixed;
  overflow: hidden;
  width: 100%;
  height: 44px;
  min-width: 320px;
  max-width: 1080px;
}
.se_btn {
  position: absolute;
  top: 0;
  left: 0;
  width: 40px;
  height: 100%;
}
.se_btn::before {
  content: '';
  display: block;
  position: absolute;
  top: 14px;
  left: 15px;
  width: 20px;
  height: 18px;
  background: url(../img/s-btn.png) center / cover no-repeat;
}
.se_login {
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 100%;
  line-height: 44px;
  color: #fff;
}
.search {
  position: relative;
  height: 30px;
  background-color: #fff;
  margin: 7px 50px;
  border-radius: 15px;
}
.jd-icon {
  position: absolute;
  top: 8px;
  left: 15px;
  width: 20px;
  height: 15px;
  background: url(../img/jd.png) center / cover no-repeat;
}
.jd-icon::after {
  content: "";
  position: absolute;
  border-right: 1px solid #ddd;
  top: 0;
  left: 26px;
  height: 16px;
}
.sou {
  position: absolute;
  top: 8px;
  left: 50px;
  width: 18px;
  height: 15px;
  background-color: pink;
  background: url(../img/jd-sprites.png) center no-repeat;
  background-size: 200px auto;
}
.slider img {
  vertical-align: middle;
}
.brand {
  display: flex;
}
.brand div {
  width: 33.3%;
}
.brand img {
  width: 100%;
}
nav a {
  float: left;
  width: 20%;
  text-align: center;
}
nav a img {
  width: 40px;
}
